In the Middle - Late Triassic, the first episode of Indosinian Orogeny led to the uplift of the Qinling Mountain. In the same period, earthquakes and volcanic activities occurred frequently. A large number of geological event sedimentary layers were preserved in the Ordos Basin. In order to understand the sedimentary sequence of geological events under the influence of tectonic activities, explore the coupling relationship of various geological events in the geological history, and understand the formation and evolution process of large depression lake basin from a new perspective.Methods:Based on the Chang 7 oil member as the research object, and analyzes the sedimentary characteristics of seismites, turbidites, tuffs and organic rich shale corresponding to seismic events, turbidity events, volcanic events and anoxic events and studied their superimposed relationships.Results: In the Chang-7 period, various event sedimentary sequences in the lake basin were controlled by the Qinling orogeny in the Middle - Late Triassic. The subsidence of the lake basin caused by tectonic activities provided conditions for the preservation of event sedimentary layers. Volcanic eruption volcanic ash formed tuffaceous strata, which created conditions for anoxic events in the lake basin. Seismic events formed seismites and led to turbidity current events.Conclusions:The alternation of these geological events constitutes the result of the superposition of various event sedimentary layers in Chang 7 oil member.